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Fourth Power

Massachusetts, US · Founded 2021 · 36 employees on LinkedIn · 4 known investors

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Fourth Power develops thermal energy storage technology that converts electricity into heat for storage and back to electricity on demand, using high-temperature molten tin and thermophotovoltaic conversion. The company targets utility-scale and industrial applications for grid energy storage and decarbonization.

CleantechClimate TechDeep TechEnergyHardware

Founders & leadership

Fourth Power was founded in 2021 by Asegun Henry.

AHAsegun Henry
Asegun HenryFounderAsegun Henry is a heat transfer researcher who completed his postdoctoral training at MIT and held faculty positions at Georgia Tech before founding Fourth Power. His prior research focused on solar fuels, thermochemistry, and phonon transport, including development of a high-temperature liquid metal pump, and he is now commercializing thermal energy storage technology developed over a decade in academic laboratories.
AGArvin Ganesan
Arvin GanesanFounder

Investors · 4

DCVC (Data Collective)✓ confirmed by Fourth PowerPalo Alto · $5M – $25M

How we know: the company's own site · funding news · startuphub.ai · open dataset · 5k.vc investor directory · Not right? Tell us

Munich Re VenturesreportedSan Francisco

How we know: startuphub.ai · the VCSheet dataset · Not right? Tell us

Also in the syndicate · 1

Munich Re

Funding

SEC filings, press & company announcements

$40M disclosed across 2 rounds · 2025

Source: company announcements and press reports — follow each round's link for the claim.

Founder mafia

2 people who came through Fourth Power went on to found or lead other companies.

Jason HartloveChairmanFounded Nanosys +1Derek WarnickAdvisorFounded Electric Hydrogen

Non-dilutive funding · 1 SBIR/STTR award

Federal grants — no equity taken
AgencyPhaseYearAmount
National Science FoundationPhase I2023$275K

Source: SBIR.gov award data (U.S. Small Business Administration). SBIR/STTR awards are competitive federal R&D grants and contracts — non-dilutive capital alongside any venture rounds above.

In the news

Fourth Power Raises $20M in Series A Plus Fundingfinsmes.com · Sep 2025Fourth Power Raises $20 Million to Commercialize Low-Cost Utility-Scale Energy Storage Solution - Fourth Powergofourth.com · Sep 2025

Frequently asked questions

What does Fourth Power do?
Fourth Power develops thermal energy storage technology that converts electricity into heat for storage and back to electricity on demand, using high-temperature molten tin and thermophotovoltaic conversion. The company targets utility-scale and industrial applications for grid energy storage and decarbonization.
Who founded Fourth Power?
Fourth Power was founded by Asegun Henry in 2021.
Who are Fourth Power's investors?
Fourth Power's investors include Breakthrough Energy Ventures, DCVC (Data Collective), Munich Re Ventures.
How much funding has Fourth Power raised?
Fourth Power has disclosed $40M raised across 2 rounds.
Where is Fourth Power headquartered?
Fourth Power is headquartered in Massachusetts, US.